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LM3431MH

更新时间： 2024-11-23 04:18:55
品牌 Logo 应用领域
美国国家半导体 - NSC 驱动器稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
24页 539K
描述
3-Channel Constant Current LED Driver with Integrated Boost Controller

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中文翻译

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LM3431MH 技术参数

是否Rohs认证：不符合生命周期：Transferred
包装说明：PLASTIC, TSSOP-28Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.15Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：36 V
最小输入电压：4.5 V标称输入电压：12 V
JESD-30 代码：R-PDSO-G28JESD-609代码：e0
长度：9.7 mm湿度敏感等级：1
功能数量：1端子数量：28
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：0.7 A封装主体材料：PLASTIC/EPOXY
封装代码：HSSOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH认证状态：Not Qualified
表面贴装：YES切换器配置：SINGLE
最大切换频率：1100 kHz温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn85Pb15)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
宽度：4.4 mmBase Number Matches：1

LM3431MH 数据手册

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December 20, 2007  
LM3431/LM3431A  
3-Channel Constant Current LED Driver with Integrated  
Boost Controller  
General Description  
The LM3431 is a 3-channel linear current controller combined  
with a boost switching controller ideal for driving LED back-  
light panels in space critical applications. The LM3431 drives  
3 external NPN transistors or MOSFETs to deliver high ac-  
curacy constant current to 3 LED strings. Output current is  
adjustable to drive strings in excess of 200 mA. The LM3431  
can be expanded to drive as many as 6 LED strings.  
Features  
3-channel programmable LED current  
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High accuracy linear current regulation  
Analog and digital PWM dimming control  
Up to 25kHz dimming frequency  
>100:1 contrast ratio  
Integrated Boost controller  
The boost controller drives an external NFET switch for step-  
up regulation from input voltages between 5V and 36V. The  
LM3431 features LED cathode feedback to minimize regula-  
tor headroom and optimize efficiency.  
5V-36V input voltage range  
Adjustable switching frequency up to 1MHz  
LED short and open protection  
Selectable fault shutdown or automatic restart  
A DIM input pin controls LED brightness from analog or digital  
control signals. Dimming frequencies up to 25 kHz are pos-  
sible with a contrast ratio of 100:1. Contrast ratios greater than  
1000:1 are possible at lower dimming frequencies.  
Programmable fault delay  
Programmable cycle by cycle current limit  
Output Over Voltage Protection  
The LM3431 eliminates audible noise problems by maintain-  
ing constant output voltage regulation during LED dimming.  
Additional features include LED short and open protection,  
fault delay/error flag, cycle by cycle current limit, and thermal  
shutdown for both the IC and LED array. The enhanced  
LM3431A features reduced offset voltge for higher accuracy  
LED current.  
No Audible Noise  
Enable pin  
LED Over-Temperature shutdown input  
Thermal Shutdown  
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TSSOP-28 exposed pad package  
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Applications  
Automotive Infotainment Displays  
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Small to Medium Format Displays  
Typical Application Circuit  
30041101  
© 2008 National Semiconductor Corporation  
300411  
www.national.com  
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